Mitsubishi Electric Corporation

Yutaka Higuchi

Toshiaki Takeoka

An electric vehicle control device comprises: a smoothing capacitor to be charged from a DC power supply via a charging resistor; an inverter converting a DC power having been charged in the smoothing capacitor to an AC power to supply it to a load; and a discharging switch causing a voltage having been charged in the smoothing capacitor to discharge via a discharging resistor, and in which a resistor is used as both charging resistor and discharging resistor to simplify a circuit arrangement. In the electric vehicle control device, there are provided a main switch inserted into a main circuit to which a DC power is supplied from the DC power supply, and an auxiliary switch that is connected in parallel to the discharging switch, and is in inverted switching states with respect to the main switch.

Control device of electric vehicles

To reduce, in a power converting apparatus for an electric locomotive, a sixth-order harmonic noise induced by a torque ripple component equivalent to a sixth-order frequency of an inverter frequency. When a motor is driven in a three-pulse mode to drive the electric locomotive, three pulses included within a &#xbd; cycle of the inverter frequency in a PWM waveform, which is used for controlling a switching element of an inverter unit that drives the motor, are set to satisfy Tq&#x2267;T/8, Tp&#x2266;Tq/2, and Tr&#x2266;Tq/2 where, assuming that the three pulses include a first pulse, a second pulse, and a third pulse from an order of generation, Tp is a pulse width of the first pulse, Tq is &#xbd; of a pulse width (full width at half maximum of a pulse) of the second pulse, Tr is a pulse width of the third pulse, and T is a cycle of the inverter frequency.

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Chiyoda-ku, Japan

Yutaka Higuchi